GPT-5.5 vs Qwen3.8-Flash-Next
GPT-5.5 has a slight edge in benchmark performance.
OpenAI · Alibaba Cloud / Qwen Team · Updated for 2026
Which is better?
GPT-5.5 outperforms in 3 benchmarks (DeepSWE 1.1, GPQA, Humanity's Last Exam), while Qwen3.8-Flash-Next is better at 2 benchmarks (SWE-Bench Pro, Toolathlon). GPT-5.5 has a slight edge in benchmark performance.
Based on current benchmark, pricing, and model metadata for 2026.
Choose GPT-5.5
- you want the strongest raw capability — it leads on 3 of 5 shared benchmarks
Choose Qwen3.8-Flash-Next
- you want the most recent training data — it shipped Aug 2026
- you need open weights you can self-host or fine-tune
At a glance
The differences that matter most.
Performance Benchmarks
Comparative analysis across standard metrics
GPT-5.5 outperforms in 3 benchmarks (DeepSWE 1.1, GPQA, Humanity's Last Exam), while Qwen3.8-Flash-Next is better at 2 benchmarks (SWE-Bench Pro, Toolathlon).
GPT-5.5 has a slight edge in benchmark performance.
Arena Performance
Playground indexes and blind preference scores
Context Window
Maximum input and output token capacity
Only GPT-5.5 specifies input context (1,050,000 tokens). Only GPT-5.5 specifies output context (128,000 tokens).
Input Capabilities
Supported data types and modalities
Both GPT-5.5 and Qwen3.8-Flash-Next support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-5.5
Qwen3.8-Flash-Next
License
Usage and distribution terms
GPT-5.5 is licensed under a proprietary license, while Qwen3.8-Flash-Next uses Qwen Community License 1.0.
License differences may affect how you can use these models in commercial or open-source projects.
Proprietary
Closed source
Qwen Community License 1.0
Open weights
Release Timeline
When each model was launched
GPT-5.5 was released on 2026-04-23, while Qwen3.8-Flash-Next was released on 2026-08-26.
Qwen3.8-Flash-Next is 4 months newer than GPT-5.5.
Apr 23, 2026
4 months ago
Aug 26, 2026
0 days ago
4mo newerKnowledge Cutoff
When training data ends
GPT-5.5 has a documented knowledge cutoff of 2025-12-01, while Qwen3.8-Flash-Next's cutoff date is not specified.
We can confirm GPT-5.5's training data extends to 2025-12-01, but cannot make a direct comparison without Qwen3.8-Flash-Next's cutoff date.
Dec 2025
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Outputs Comparison
Judge for yourself.
Run your own prompts against GPT-5.5 and Qwen3.8-Flash-Next side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-5.5 vs Qwen3.8-Flash-Next.